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(: Test: K-SeqIndexOfFunc-7                              :)
(: Written by: Frans Englich                             :)
(: Date: 2007-11-22T11:31:22+01:00                       :)
(: Purpose: A test whose essence is: `empty(index-of(xs:double("NaN"), xs:float("NaN")))`. :)
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empty(index-of(xs:double("NaN"), xs:float("NaN")))